Photo: John Lamparski/Getty Images

Former Trump campaign manager Corey Lewandowski announced in a Tuesday tweet that he will not run for Senate in New Hampshire next year despite the fact that he is "certain [he] would have won."

The backdrop: Lewandowski had been weighing a bid against the incumbent Democratic Sen. Jeanne Shaheen, who has held her seat since 2009.

  • Lewandowski testified in September before the House Judiciary Committee, where he combatively refused to answer questions that involved his conversations with President Trump not explicitly referenced in the Mueller report.
  • At the time, his chaotic performance created an overwhelming consensus among House Democrats that the hearing did nothing to galvanize public support for impeaching Trump — but it came just days before subsequent revelations about the administration's alleged attempts to pressure Ukraine into investigating Trump's political rivals.

The state of play: In September, a former Trump administration official told Axios' Alayna Treene that "the ultimate risk with Corey running is that the negative coverage he receives in New Hampshire could drag Trump down" in the 2020 presidential election.

What to watch: Lewandowski tweeted he will soon give an endorsement in the Republican primary for the seat.

  • He said that his ideal candidate would "put our citizens first and not illegal aliens" and "support pro-growth policies to keep the Trump economy strong."

Go deeper: How Trump wins in 2020

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Trump announces new Iran sanctions in effort to maintain international arms embargo

Photo: Anna Moneymaker-Pool/Getty Images

President Trump signed an executive order on Monday that would impose sanctions on any person or entity that contributes to the supply, sale, or transfer of conventional arms to or from Iran or is engaged in providing training and financial support related to those weapons.

Why it matters: The executive order is the first step by the Trump administration to put teeth into its claim that international sanctions on Iran were restored over the weekend, one month after the U.S. initiated the "snapback" process under a United Nations Security Council resolution.

Exclusive: Conservative group launches $2M Supreme Court ad

Screengrab of ad, courtesy of Judicial Crisis Network.

The Judicial Crisis Network is launching a $2.2 million ad campaign to put pressure on vulnerable Senate Republicans in battleground states to support a quick confirmation when President Trump announces his Supreme Court nominee.

The big picture: "Follow Precedent," previewed by Axios, is one of the first national and cable television ads to run following Justice Ruth Bader Ginsberg's death Friday.

Updated 28 mins ago - Politics & Policy

CDC says it mistakenly published guidance about COVID-19 spreading through air

CDC Director Robert Redfield. Photo: Anna Moneymaker/Pool/Getty Images

The CDC has removed new guidance that acknowledged airborne transmission of the coronavirus, posting in a note on its website that the guidance was only a draft and had been published in error.

Why it matters: The initial update — which was little noticed until a CNN story was published Sunday — had come months after scientists pushed for the agency to acknowledge the disease was transmissible through the air. The CDC previously said that close person-to-person contact was the bigger concern, and the language has been changed back to erase the warning about airborne transmission.